<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form>
        <input type="radio" name="sex" value="male" checked>
        <br/>
        <input type="radio" name="sex" value="female">
    </form>
</body>
</html>